Macrophages in Skin Wounds: Functions and Therapeutic Potential

Area of Science:

• Immunology
• Dermatology
• Regenerative Medicine

Background:

• Macrophages play a key role in regulating cutaneous wound healing processes, including immune surveillance, tissue repair, and remodeling.
• Depletion of dermal macrophages impairs wound closure, affecting vessel density, fibroblast proliferation, re-epithelialization, and scar formation.
• Paradoxical findings of scarless healing in certain contexts (e.g., fetal wounds, oral mucosa) without macrophages have fueled debate on their indispensable role.

Purpose of the Study:

• To review recent findings on skin macrophage subsets and their functional importance in adult cutaneous wound healing.
• To explore the plasticity of macrophage phenotypes and the molecular drivers influencing their function.
• To discuss the potential therapeutic benefits of targeting skin macrophages for clinical applications.

Main Methods:

• Literature review of recent research on macrophage subsets in cutaneous wound healing.
• Analysis of studies investigating macrophage plasticity and molecular regulation.
• Synthesis of findings related to therapeutic targeting of macrophages.

Main Results:

• Macrophages exhibit diverse subsets with distinct roles in wound healing.
• Macrophage plasticity allows for dynamic functional changes throughout the healing process.
• Targeting specific macrophage subsets holds promise for modulating wound repair and reducing scarring.

Conclusions:

• Recent advances in characterising macrophage subsets and their plasticity provide critical insights into their functional significance in skin wound healing.
• Understanding these nuances is essential for resolving controversies and developing effective therapeutic strategies.
• Targeting macrophages presents a promising avenue for enhancing cutaneous wound healing and minimizing adverse outcomes like fibrosis.